Harry Potter and the Half Blood Prince has over 650 pages, Harry Potter and the Order of the Phoenix has over 750, so it’s no surprise that a new Potter-centric bibliography would boast a hefty 544 page count.

Written by by author and Sotheby’s director for children’s books Philip Errington, the hefty tome is the new J.K. Rowling: A Bibliography 1997-2013, which details some of the behind-the-scenes action that occurred during the creation of the wildly-popular series.

The book has not yet been released in the U.S., but The Guardian has read it and doled out a few highlights from the book. Included in the mix is the fact that after rounds of revisions and edits on her third Harry Potter novel, Harry Potter and the Prisoner of Azkaban, Rowling wrote her editor to say, “I’ve read this book so much I’m sick of it.” She later confessed that she would be “hard put to smile when it comes to doing public readings from it.” Luckily no one else seemed to agree, as the book went on to become the eighth bestselling book of all time.

Other details make the publication of Potter novels sound like something out of a John Le Carré story (or for the kids these days: an episode of The Americans). When Rowling’s then-agent Christopher Little had to pass off the finished manuscript of Harry Potter and the Order of the Phoenix to her publisher at Bloomsbury, he met Bloomsbury's chief executive Nigel Newton in a pub arriving with a plastic Sainsbury’s bag in one hand, which he placed by his feet at the bar. When Newton left the pub, in true espionage fashion, he took the bag with him, stashing the contents in his home safe. “By this stage the series was so enormous that I was almost frightened to be in physical possession of it,” said Newton, according to The Guardian.

Other highlights include the fact that Hogwarts haunter Nearly-Headless Nick was meant to have a song, but the editor cut it, much to Rowling’s dismay, and that Harry Potter and the Goblet of Fire was almost named Harry Potter and the Three Champions.

There are undoubtedly many more mysteries to be revealed in the book’s 544 pages, which makes this Chamber of Secrets well worth peeking into for Potter fans.